Fish of subclass Chondrostei. Sturgeons are
large, with five rows of bony plates, small
mouths, and four barbels. They are voracious
feeders. The beluga Huso huso of the Caspian
can reach a length of 8 m/25 ft and weigh
1,500 kg/3,300 lb. The common sturgeon
Acipenser sturio of the Atlantic and
Mediterranean reaches a length of 3.5 m/12
ft.